Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Joaquin Project - Argentina [Member]	Joaquin Project - Argentina [Member] Common Stock	Joaquin Project - Argentina [Member] Additional Paid-In Capital	Joaquin Project - Argentina [Member] Accumulated Deficit	Joaquin Project - Argentina [Member] Accumulated Other Comprehensive Loss	Orko Silver Corporation	Orko Silver Corporation Common Stock	Orko Silver Corporation Additional Paid-In Capital	Orko Silver Corporation Accumulated Deficit	Orko Silver Corporation Accumulated Other Comprehensive Loss	Global Royalty Corporation	Global Royalty Corporation Common Stock	Global Royalty Corporation Additional Paid-In Capital	Global Royalty Corporation Accumulated Deficit	Global Royalty Corporation Accumulated Other Comprehensive Loss
Stockholders' equity, Beginning of Period at Dec. 31, 2011	$ 2,136,721	$ 897	$ 2,585,632	$ (444,833)	$ (4,975)
Balances, in shares at Dec. 31, 2011		89,655
Increase (Decrease) in Stockholders' Equity
Net income (loss)	48,677	0	0	48,677	0
Other comprehensive loss	(2,746)	0	0	0	(2,746)
Common stock share buyback, shares		(893)
Common stock share buyback	(19,971)	(9)	(19,962)	0	0
Common stock issued for acquisition, shares							1,310
Common stock issued for acquisition						30,000	13	29,987	0	0
Common stock issued under long-term incentive plans, net	5,599	2	5,597	0	0
Common stock issued under long-term incentive plans, net, in shares		270
Stockholders' equity, End of Period at Dec. 31, 2012	2,198,280	903	2,601,254	(396,156)	(7,721)
Balances, in shares at Dec. 31, 2012		90,342
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(650,563)	0	0	(650,563)	0
Other comprehensive loss	2,815	0	0	0	2,815
Common stock share buyback, shares		(1,691)
Common stock share buyback	(27,552)	(17)	(27,535)	0	0
Common stock issued for acquisition, shares												11,573					2,130
Common stock issued for acquisition											179,140	116	179,024	0	0	22,198	21	22,177	0	0
Common stock issued under long-term incentive plans, net	6,249	5	6,244	0	0
Common stock issued under long-term incentive plans, net, in shares		489
Stockholders' equity, End of Period at Dec. 31, 2013	1,730,567	1,028	2,781,164	(1,046,719)	(4,906)
Balances, in shares at Dec. 31, 2013		102,843
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(1,155,884)	0	0	(1,155,884)	0
Other comprehensive loss	2,098	0	0	0	2,098
Common stock issued under long-term incentive plans, net	8,537	6	8,531	0	0
Common stock issued under long-term incentive plans, net, in shares		541
Stockholders' equity, End of Period at Dec. 31, 2014	$ 585,318	$ 1,034	$ 2,789,695	$ (2,202,603)	$ (2,808)
Balances, in shares at Dec. 31, 2014		103,384